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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac8f11e8b9f1b343f6d71d2883abd740d66c497155b09b972c276622c86f5ab6' 
  AND token = 'kH90/OUGxvv4NGmWW0e2y1Ug5ncCOJk5zJQqh7EaceQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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