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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8c0add3425eb0fa0145ee494b2171a49ab3b484054082491a890ca3b858564' 
  AND token = 'bK26xI25XbgvniB3TaL1bh9MCTX5T8xlmveyznW2kv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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