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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd619cb9548f52ad325e711948bc2ba8a7d2e44bf1fa14a5c843cef27f3ceb26c' 
  AND token = 'rqUqlKuVf+ZGRnNSVUAHatMEZF3U48eSOpoQvObiZhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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