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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f63e76e16e0f6722b4b8384be978bd939c23bf478271a0f42ab157c9411f8810' 
  AND token = '4G8TA4N0TDeTcWcKK623iMY3gYR4+1XM38ky6h701zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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