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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7f9c1cf61c72dade27b6e9ab3fa30fc5654dfb7aff265c7aadeedbe906b86d' 
  AND token = 'PadzKtW9EIz0vaU5WzjkVo2w0U0yNHXHu/ENpVslOfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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