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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da90e7237c74c26ee3f8861fb14ea0496526e30fb336c142547fd20b573bee6' 
  AND token = 'qO+AUgptKS8qVy5iHS0Xf2yMIvrNyd+DK90SgJnwlUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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