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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29ee7dcb6cdac6e9722c66d159e767a66104bd1df73895dba6ab3bf679786e0' 
  AND token = 'My9dmU8u6zJBsM/S2Jjfxv3fvArhKnS2kX6ev0AbqjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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