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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0086cab4c0d9eef32e09452b20147e7e3781498f8ea3cda7e52ca150ce64c6e' 
  AND token = 'SAYJ6d1EXwPYHYMMXVEHNAWVnxZRzAg3TDu1P/0IwHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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