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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bab5d4c5a9cbb4dc9ac9b10be2976e0e5f53881a3905bd5f489895fc8a43b6' 
  AND token = 'Des+puoivu91/9w8hNJdkXfwwcbCKrWQMdQFVHE7NDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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