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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45d1636fbf37f100b7aa51f8419169130e345c0048592c0c1fd0b038d7a8222d' 
  AND token = 'X5DBQecn7y5b6Khtgqpj8qm6g0NNGvn7WZ9zSkJeebQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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