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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd30e123174d4301c186358e2e97014e6face3df0d2af0feac3ee75e130e30ba' 
  AND token = 'i05Vb4JVF8Y8W3W8dc5VYc9FsnaV5+10VM35BmhjxrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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