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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984e64f611c1096be6b1470bf6b674cb9e6b19a67b799fb187c69d3013522175' 
  AND token = '0WnlRc85jajDkMAI84Zkno0ibza1DZynC7CgWw1DiI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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