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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4470be5a105074144fe0da409954d6ff3622cb7796c58f4d785a42163e0162b' 
  AND token = 'YoHKOmc+Ct1VGQmDt1y+VqWkEyZIekvoKQLYSzs8m4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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