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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1afd707510a55bde86b33e1060a6e618e0315d6898b633cafe159ef183105184' 
  AND token = 'F0Um4X6Ot8OqpK9Tu0hYg2OZdPyrHsH2EfC57RuLATw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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