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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099246b8987eecfa3b31264a1c1519758ba666d39717c3ccb6231e4560c5a14d' 
  AND token = 'MUkCDKjSDNNSvR94ZAeCu3d+hHfJCIBQ8MrwfX6PEjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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