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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e06677b6848ad26f6193df2a69ef4aed3090d30080aaf6d798dd527f10dc06b' 
  AND token = 'q2NjkFDdFN4+7Z5pVOfGHXDY0DJWsoGaaFa3JOEiQvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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