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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89339f0ed54930d0bc4833173fe29ee636fa591a5876b8ab1a294996ad8e0f0a' 
  AND token = '9GB44if3TNbs+C+7S+XHx4YHUdMqn4piHKSoeiIPHoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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