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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2603064b2f150718708d539edbfc07efb425ad49d5ce9d45082039eff0447489' 
  AND token = 'hSu/gCJuOpsdweJgjGg7i+myn1XgrXbIex4246QfkOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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