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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936720ad848ca58adeb8acf60e911e4497f0ef2b7add23380fc2d43c536a0a4c' 
  AND token = 'vdeWdLFG5zKhm1LHeANf8H/cbtsUbx4nqsgultM66Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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