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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0644064c14fc24b47edb8033b2d7de04a2813c1ea24de958d9eef6a868a2a574' 
  AND token = 'bIObHOFd88/uoZV+I81npd2WMB99L3yX17BQhW0Cjr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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