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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cca6f5def4c3777054cdf01a17c7788ef7ba070deeb32b3626bd83f79fbfbd6' 
  AND token = 'gZoxWBw0ousbuBjSR81qBbSL3YH61idtE4egH/xQXk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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