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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f908353335918169582b874b414b676313d670c139c5f4cd12a431255f5d6b' 
  AND token = 'm4QkWunTzXp11mlE4mFfsujE2QBVBjz6RCXHk/PWPn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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