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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e9f46879e1892ca4abb9474d528edd635a813f553487d326a64f7e94f88352' 
  AND token = '+hmITBVXM3nySJ97nzht2DS7sb6fzWqTPqW1L5+SxAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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