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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63196ff55a8445c5fcddc42dbc09c8cd1072bc17d806155a89a3d798b993a8eb' 
  AND token = 'JLPlwIZDpSSYw5inoKhUyVky5XmypADkRa3398pFNSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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