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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '589804c6597ff9b93e175d94ab45163054ff3d0b999d656ef4d29c36770f25d2' 
  AND token = '/7rUEfL0PbtRk/rp5RUrcvMsdmhqUPm4kbSV4KMqA0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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