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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3db9b5c0ac242bc96b3a6bb0c1d12cbdc65896643950ea5132ac2d343302cb' 
  AND token = '7mYUxZf/7K/LP6Nv5j1YdVD4/97ljnS/Zw+/hI8b2KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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