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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173fcc9b9eca809da1151e7986890afe05e905986874ce2c4964c5fba6bf30e9' 
  AND token = 'Pow3u9yiNmQ2BvVGfkEBHGra2QcwdrUDG9jd3o+M3r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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