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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807e240696d3c169310ca7f8aa0892d799dfe735d75f4681a7ed7bc4997155f1' 
  AND token = 'kjxXurrOCkufTfOHJRlrxYELhPzjT+po4pK+nppOjLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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