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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f39cb608ec547fd7ccc91ee08cca589bbaac807bf9135f87623e77238b3a9a7' 
  AND token = '1Q4MltYRz3UFNDhQ+vNhS8mf95EZ3NK+CeCJqPOSEYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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