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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1261e80649c39a5f90f0d2f72ccc554f8c4efdccd9acaf9893b259e10b3cf9a' 
  AND token = 'W00lf/JpYR7ofPuIMFSbKJfJkp3bomi4OXHZep53M3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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