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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1ccdbde9215681494d1c459f6ea88569c4002aaa295040e1c81b9a9a343b8a' 
  AND token = 'oAXiht2qx5K9whsRc3IzfYXVVwK/l5NU2F35qpskWfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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