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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3522f0b8b05e17ca3c63a87eaaa4a166afaf9de4248944ac8ae0c654d506d146' 
  AND token = 'cirHe44dPBP6nYG8ftZ2/7zJdE+dhS86Vc9auWmvf4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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