SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e7c2b8bcf92d04b15115ad5410c679369b87ccf1aa591813c88f5643806aabb' 
  AND token = '/Nq8QvX6AZKtLqPnpvepDor+3vuORF4zgUSZwg095ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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