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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f1559eb7719f3c6f1d0af2c878a8ac99b0a78a29e2f4b50ba300a11a99ecf15' 
  AND token = 'bqpa26G27VhZvccrp5Ydc0FTx9NOItQg2cZZSBZ9sgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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