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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8636bb2fa470590fbf0a87d9c05f522065084d9b57df7ae1cd473efc5a4fa095' 
  AND token = 'A4bQEe2ZAi4Ev8jyAUOkMBi234dsb9JSmm6jeAUloB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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