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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba466e721d9eb48e05e9a0cfdaa652b8d088b639549891b2f46f29963bc82d6' 
  AND token = 'XgV/zuhbd7UbfqmeKdI41WAFW2fB7s+M97xzARvh6/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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