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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff00e4177f96207e4e98de73c7a06cd37fae92630cf046bd1ce5b66a50ee9922' 
  AND token = '5XUukJjXUp7cFV+lnyr8NKITaZkoedi2t5A6UXWosF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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