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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c8cd20e54024c8602d513b36ac3afb94c012fcf5f1b3deff272992166cb69d' 
  AND token = '+Ngfa3qFO3R+WogdCb5ZeH4VcaabrITPQMZLsQUvsE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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