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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2309804dd4b540d6e4f6d12cc49c998f7b038b250f4b420a19251b1e52e9caf' 
  AND token = 'ZKPs/C7ZgcZgtJy3h9We/sALmOT0JtWgqiLaHXUBes0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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