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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3f3de383c51e717db217a6d76b407d6007ba92930703d6c195003edd429d81' 
  AND token = 'Xw32ai8yR6Xgb0X1QZk1op5SPKsz6aUAn3ex45ljwCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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