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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5462a1e288ae045c5a24b36c7bda5097c607d8e34003e4e91471e0fede8433e7' 
  AND token = 'zSPDCA6DHWBHjarv/mZP1bCYQG9y8oY0Al1tUn8I2do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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