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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bf264a691e2ed0e1aadaeaec41f6fc5fc68944a0102c403b9ceebe9a63d1c7' 
  AND token = 'HOGhcl2B3GwpbM26QwqZKncynRIi1QrYWImP72CI5Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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