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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870702a786cb53a2d8c632d29cc26e9a95e0706c2b81420fb2d79a4d97f54446' 
  AND token = 'wiEkA3G0DsIUV7KIBnSMY27MzE+PqYpgB3byTF4Xdxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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