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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40c27dff0579a6f666fbe790f9d62f0db9b1df659faa31b9c14426a722cbc57' 
  AND token = 'v+DRSLoUmP9oXJ8ekHhHPkeYMt/oaNYINL+tKQBQF3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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