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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8527aeab9013774c5ddfbda2df518bec791116b1a8dd9a4f78450c4f2fe1e33' 
  AND token = 'lFvoGThga0R/yofudueR+YiRyXGYJ3d61Ew2rh3K4gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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