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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '364a71a88141cac7f310d7ba11eaa0061f80bcbe0010d6714fc1a6221e93242b' 
  AND token = 'SK/HQR4t/ITLFzbh/lW9kTc9v1sgtpzC//SASUwLKFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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