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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9fbb34bf1ad960713f76883557a3bdb46f8f0fa443bb0353b07ac4366a95d46' 
  AND token = 'tp/RNZMpe0rWRk5w5Cc+6sJU5zACfhRvKUBKcW+RS6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00157

JSON explain

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