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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ae4e3f279a57d343c96252a56bcc28f7831ff7ac823302b6bcec16bf2d9a94' 
  AND token = 'GkzgBMnaP705wNggoh83BLo5S3AKg/SCkfWyW1LYNTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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