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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c3224851e44cba026b4d36e5e856495f0411986f84beaa164ba70b9bc109fd' 
  AND token = 'FLL4pt29sVYZoumti6UF/ODEakRaE3usQB0ASo0GVM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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