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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d4f89ab63e85250bf48578e2512f6a9d7f5ba77c9bae255b599d64dbf73a97b' 
  AND token = 'zXk+fW4yQqxP9xhtv+OMvtgfUyicEgQsLuM7SBGA+eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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