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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb942d898d90d1d203bd4f053f5db867b3c0d7cdb66772f2e440f35d94c2b9b' 
  AND token = 'pWHjV0rI91/OdSHzVyb9VI/zytV4hr3WvvYIoTVIF+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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