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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73eeddb821c45ea019e1575b84c1ff16f9a08a94e5f07badfb58ef24f40608c6' 
  AND token = 'VP5ZZgH2bHY8S94Rv/JmlA7bqjLWCIYgaoocpA8qfxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}