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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809bf628db65e111a546337a43ddb137b583ce62be314965a3a6a3b2deb427a9' 
  AND token = '+zVRU9PoaQ6tOA8aCXIjCkCszpC+hoLIac1YmOYDBJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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