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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096905ef724c688c169842867c500f18dd1b9f4784d06dad07c62e061bfa3cca' 
  AND token = 'KTUXcolWwa13ryWU2+L6WrtdS4NdUYoFwT/rkbfqAwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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