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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d85ece66bb15ab78d8a11af9ee06f872e09c7c4ebb427bf871f79bb560250d' 
  AND token = 'M1ZGQnYM/WNx9BGTdMIMaYK82a2Htp6Ncq+VEwAYkwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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