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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3120f9d00344ff8425f8b84761dfc1af0c08893fd8880387bdf0af9d9bc805' 
  AND token = '2GbkXYV4DeSzD3dN4Dvw5YOdG67PeDBl3BzudSpqwO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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