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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f9e77bb4b15aeca75ca8faa91933455255e0f526f30eaefb6a4973b32a7b71' 
  AND token = 'kzf11nNUTMINb3VTC6Wy3mxrpiQ2jPdx8CfmhTxciSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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